1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Nezavi [6.7K]
3 years ago
7

Superman is riding his bicycle. At the base of a hill, he has a specific amount of kinetic energy. Then he coasts up the hill wi

thout pedaling. He comes to a stop at the top of the hill. Why is Superman’s potential energy at the top of the hill less than his kinetic energy at the bottom of the hill?
A. The hill did work on the bicycle as he went up the hill.
B. The rest of the energy is stored in the muscles of his body.
C. He still has kinetic energy while stopped on the top of the hill.
D. Friction and air resistance created heat on his trip up the hill.
Physics
1 answer:
algol133 years ago
7 0

Answer:

D. Friction and air resistance created heat on his trip up the hill.

Explanation:

Energy transformation from one form to another is not 100% efficient. This is the postulate of the first law of thermodynamics.

Most of the energy transformation is not purely 100%.

When energy is transformed, some are usually wasted.

  • In this case, in moving from bottom up, Superman produced some heat and encountered air resistance.
  • To reach the top, he must have overcome the resistance and produce enough heat to power him through.
  • This reduces the amount of potential energy that should have been the same as the kinetic energy down below.

You might be interested in
Find the total electric charge of 1.7 kg of electrons. me=9.11×10−31kg, e=1.60×10−19C.
Gelneren [198K]

Answer:

2.99\cdot 10^{11}C

Explanation:

The mass of one electron is

m_e = 9.11\cdot 10^{-31}kg

So the number of electrons contained in M=1.7 kg of mass is

N=\frac{M}{m_e}=\frac{1.7 kg}{9.11\cdot 10^{-31}kg}=1.87\cdot 10^{30}

The charge of one electron is

e=1.60\cdot 10^{-19} C

So, the total charge of these electrons is equal to the charge of one electron times the number of electrons:

Q=Ne=(1.87\cdot 10^{30})(1.6\cdot 10^{-19}C)=2.99\cdot 10^{11}C

8 0
3 years ago
10m= (5.0) + (.5)(9.8)(5.0)
Norma-Jean [14]
M=2.45 because you multiply out the equation on the right and divide by 10
8 0
3 years ago
________ serve as the site for photosynthesis.
Amiraneli [1.4K]
The answer is going to be leaves.
6 0
3 years ago
Read 2 more answers
What is the acceleration of a car that goes from 40 m/s to 80 m/s in 2s?
Law Incorporation [45]

Answer:

2

Explanation:

pls brainlyest i need it

3 0
2 years ago
Which of these phenomena results in polarization of light?
Cerrena [4.2K]
<span>its reflection of light from a glass surface
</span>
4 0
3 years ago
Read 2 more answers
Other questions:
  • In which scenario does radiation occur?
    6·2 answers
  • What is pitch related to?
    8·1 answer
  • On a warm, balmy summer day you decide to relax by watching the latest building renovation in your neighborhood. You notice that
    13·1 answer
  • A 50 mL graduated cylinder contains 25.0 mL of water. A 42.5040 g piece of gold is placed in the graduated cylinder and the wate
    6·1 answer
  • In which of these examples is the greatest movement occurring?
    14·1 answer
  • What is the pupose of ecological succession?
    15·1 answer
  • Two physics students, Ben and Bonnie, are in the weightlifting room. Bonnie lifts the 50 kg barbell over her head (approximately
    5·1 answer
  • Construct c = a + b by drawing and calculating the direction and magnitude of c. The direction should be
    10·1 answer
  • What is the best definition of stress?
    9·2 answers
  • Analyze the relationship between total internal reflection and the critical angle.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!